Multiple vulnerabilities in SolarWinds Serv-U FTP Server



Published: 2021-02-03 | Updated: 2021-02-12
Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2021-25276
CVE-2020-35482
CVE-2020-35481
CVE-2020-27994
CVE-2020-28001
CWE-ID CWE-276
CWE-79
CWE-94
CWE-22
Exploitation vector Network
Public exploit Public exploit code for vulnerability #4 is available.
Public exploit code for vulnerability #5 is available.
Vulnerable software
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Serv-U FTP Server
Server applications / File servers (FTP/HTTP)

Vendor SolarWinds

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

Updated: 12.02.2021

Updated vulnerability description for #VU50295.

1) Incorrect default permissions

EUVDB-ID: #VU50292

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25276

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions on the Windows "Users" directory. A local user with access to the system can view contents of files and obtain users' password hashes from the "%ProgramData%\RhinoSoft\Serv-U\Users\<DOMAIN>\" directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1, 15.1.1, 15.1.2, 15.1.3, 15.1.3 HF1, 15.1.3 HF2, 15.1.4, 15.1.5, 15.1.6, 15.1.6 HF1, 15.1.6 HF2, 15.1.6 HF3, 15.1.6 HF4, 15.1.6 HF5, 15.1.6.25, 15.1.7, 15.2, 15.2.1

CPE2.3 External links

http://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=28396
http://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-2-2_release_notes.htm

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cross-site scripting

EUVDB-ID: #VU50293

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35482

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1, 15.1.1, 15.1.2, 15.1.3, 15.1.3 HF1, 15.1.3 HF2, 15.1.4, 15.1.5, 15.1.6, 15.1.6 HF1, 15.1.6 HF2, 15.1.6 HF3, 15.1.6 HF4, 15.1.6 HF5, 15.1.6.25, 15.1.7, 15.2, 15.2.1

CPE2.3 External links

http://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-2-2_release_notes.htm

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Code Injection

EUVDB-ID: #VU50294

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-35481

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request and execute arbitrary macros on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1, 15.1.1, 15.1.2, 15.1.3, 15.1.3 HF1, 15.1.3 HF2, 15.1.4, 15.1.5, 15.1.6, 15.1.6 HF1, 15.1.6 HF2, 15.1.6 HF3, 15.1.6 HF4, 15.1.6 HF5, 15.1.6.25, 15.1.7, 15.2, 15.2.1

CPE2.3 External links

http://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-2-2_release_notes.htm

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Path traversal

EUVDB-ID: #VU50295

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-27994

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences passed via the "dir" HTTP GET parameter. A remote user can send a specially crafted HTTP request and read arbitrary files on the system.

Example:

https:///[host]/?Command=List&dir=\..\*.*

Mitigation

Install update from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1, 15.1.1, 15.1.2, 15.1.3, 15.1.3 HF1, 15.1.3 HF2, 15.1.4, 15.1.5, 15.1.6, 15.1.6 HF1, 15.1.6 HF2, 15.1.6 HF3, 15.1.6 HF4, 15.1.6 HF5, 15.1.6.25, 15.1.7, 15.2, 15.2.1

CPE2.3 External links

http://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-2-2_release_notes.htm

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

5) Stored cross-site scripting

EUVDB-ID: #VU50296

Risk: Low

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-28001

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: Yes

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1, 15.1.1, 15.1.2, 15.1.3, 15.1.3 HF1, 15.1.3 HF2, 15.1.4, 15.1.5, 15.1.6, 15.1.6 HF1, 15.1.6 HF2, 15.1.6 HF3, 15.1.6 HF4, 15.1.6 HF5, 15.1.6.25, 15.1.7, 15.2, 15.2.1

CPE2.3 External links

http://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-2-2_release_notes.htm

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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